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CRYOGENICS

CRYOGENICS. Stephen Muchovej Caltech. CTI Cold Head. CTI 350: 4W at 20K and 20 watts at 77K CTI 1020: 12W at 20K and 35 watts at 77K Could use Oxford cryogenic too. CTI Compressor. CTI 350 (~$4K) uses either Model 8200 (~$5K) or 9600 (~$8K)

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CRYOGENICS

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  1. CRYOGENICS Stephen Muchovej Caltech

  2. CTI Cold Head CTI 350: 4W at 20K and 20 watts at 77K CTI 1020: 12W at 20K and 35 watts at 77K Could use Oxford cryogenic too

  3. CTI Compressor CTI 350 (~$4K) uses either Model 8200 (~$5K) or 9600 (~$8K) CTI 1020 (~$5K) only works with Model 9600, which is water chilled Helium lines are typically ~$30/foot + couplings

  4. Installation • Compressor in pedestal. • He lines in the equatorial mount need a 4-port rotary union ($~5K) • Slack inside the el axis • Cables need to come out here

  5. Timeline • Other people involved are Russ Keeney (design/concept) and TomiHovatta (machining/installation) • April/May: Inspection of telescope and design of cable feedthroughs • May 15: Order all helium cables/compressor/fridge head • July-August:Machining of clamps/whatever else necessary for installing the lines • September-October:Installation.

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